UpHeron
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Servers and applications

CVE-2011-0411

The STARTTLS implementation in Postfix 2.4.x before 2.4.16, 2.5.x before 2.5.12, 2.6.x before 2.6.9, and 2.7.x before 2.7.3 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack.

Severity
Medium 6.8
Published
16 Mar 2011
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
16% in the next 30 daysHigher than 97% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
CWE-264
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
PostfixServers and applications · cpe:a:postfix:postfix
  • Version 2.7.2
  • Version 2.7.1
  • Version 2.7.0
  • Version 2.6.8
All 40 release lines
  • Version 2.4
  • Version 2.4.1
  • Version 2.4.2
  • Version 2.4.3
  • Version 2.4.4
  • Version 2.4.5
  • Version 2.4.6
  • Version 2.4.7
  • Version 2.4.8
  • Version 2.4.9
  • Version 2.4.10
  • Version 2.4.11
  • Version 2.4.12
  • Version 2.4.13
  • Version 2.4.14
  • Version 2.4.15
  • Version 2.5.0
  • Version 2.5.1
  • Version 2.5.2
  • Version 2.5.3
  • Version 2.5.4
  • Version 2.5.5
  • Version 2.5.6
  • Version 2.5.7
  • Version 2.5.8
  • Version 2.5.9
  • Version 2.5.10
  • Version 2.5.11
  • Version 2.6
  • Version 2.6.1
  • Version 2.6.2
  • Version 2.6.3
  • Version 2.6.4
  • Version 2.6.5
  • Version 2.6.6
  • Version 2.6.7
  • Version 2.6.8
  • Version 2.7.0
  • Version 2.7.1
  • Version 2.7.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-0411
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-0411